FR2743536A1 - PROCESS FOR THE MANUFACTURE OF WINDSCREEN WIPER BLADES - Google Patents

Abstract

The method is used especially for making wiper blade carriers with deflector strips. The method involves subjecting a metal sheet to punching, cutting, folding, bending and other operations to form a series of parallel carrier sections (1) which are joined to the edges (9) of the sheet by bridges (8). Pins (6) are then attached to holes (15) designed for fitting the deflector strips while the carrier sections are still flat. After attaching the pins the carrier sections are folded and bent to the required shape, and are painted while still joined to the sheet edges.

Description

"Process for the production of windshield wiper blades"

  The deflector wiper blades

  wear, see Figures 1 and 2, a mount 1 receiving ma-

  pivoting nière, at its ends, two intermediate lifting beams 2 and 3 themselves pivotally supporting the main lifting beam 4 on which is fixed by hooks

  51 or similar, the wiper blade itself 5.

  On one of the edges of the mount 1 are also

  Two studs 6 which are transversely oriented are also provided.

  broom, outward, to support a

deflector 7.

  When mounting the brushes, the studs 6 re-

  first receive a spacer ring 8 then deflect

  tor is fixed on the studs by a nut.

  According to the known method used to produce these wipers, the studs 6 are fixed by crimping on each frame 1 taken individually, while the frame is finished, that is to say cut,

  folded and arched. However, this leads to many inconveniences.

nients and constraints.

  Thus, this crimping constitutes an operation requiring the individual manipulation of the frames one after the other, which has repercussions on the manufacturing costs. In addition, this crimping of studs on

  finished frames is likely to produce a deformation

  unacceptable part. Finally, the solidity of

  tion of the studs by crimping must be considered as being at its minimum limit since this crimping operation takes place on a recovery tool on which the mounts are brought individually one after the other

others.

  It should also be noted that this frame must undergo a painting operation after having received these studs 6. However, since the studs are fixed on mounts separated from each other, the subsequent painting operation necessarily involves their manipulation individual, which also results

an increase in cost.

  The present invention aims in particular to remedy these drawbacks and to this end relates to a

  process for producing windshield wiper blades

  flector comprising a frame supporting the wiper blade by means of lifting beams, this frame also being provided with studs supporting the

  deflector flap, process characterized in that

  read the frame by successive punching operations-

  swimming, cutting, bending, bending and the like with a metal strip using a tool to follow so, first of all

  to form a succession of blanks flat on the strip

  gangways connected to the edges of the strip by metal bridges

  tal, we then put in place and crimp the studs in the holes punched for this purpose, the metal strip

  always being flat, then we fold and cam

  brage of the blanks provided with their stud in order to obtain mounts still connected to each other by the

  connecting bridges at the edges of the strip.

  According to another characteristic of the invention, the strips of mounts provided with their support studs

  deflectors are subjected to a painting operation.

  The invention is shown by way of non-limiting example in the accompanying drawings in which: - Figure 1 is a top view of a wiper blade with a deflector of known type, - Figure 2 is a top view of FIG. 1, FIG. 3 is a section along AA of the frame of FIG. 2,

  FIG. 4 illustrates the process of the invention

  tion in its various stages of work of a band of met

tal on a tool to follow.

  The present invention therefore aims to achieve, at a lower cost, a windshield wiper blade with good strength, the frame of this blade

  of wiper being free from deformation.

  This mount 1 is produced on a tool to be followed with the aid of which, according to the steps,

  of advancement a, b, c, d, and e, the various operations

  cutting rations, punching, drilling, folding, cam-

  brage and others, etc. to lead to a finished frame 1 and on which it only remains to carry out the operation

  paint. These mounts are, following these operations-

  tions, still held parallel to each other by junction bridges 8 formed during the aforementioned cutting operations and which connect the frames together

  through the edges 9 of the strip.

  Thus, a determined number of frames, for example thirty, connected to each other by the bridges 8 and the edges 9, can be easily and quickly manipulated to undergo the operations of painting in the bath without, moreover, that the hooking devices. engaged on the edges 9 of the strip cannot leave a mark

  on the painting of the frames themselves.

  According to the method illustrated, first of all, at the advancement steps a and b, the punching of the strip is carried out to make all the necessary holes 11, 12, 13, 14, 15 and 16, these holes comprising for example the holes 11 intended for pilot studs, holes 14 and 17 intended for mounting pins and holes 15 intended for stud 6 for deflector support 7.

  Also, these first punch operations-

  swims carry out the lateral marking by stamping the strip at 101, these markings 101 adjoining punches 10. These punches 10 are intended to cut one of the edges of the junction bridges 8 while the stamping 101 aims to achieve a local thickness reduction

  of these junctions 8 in order to facilitate the subsequent separation

  of the frames 1 and of the side edges 9 by breaking the bridges 8 at the level of their junction with the ends

of these mounts.

  During a following step c, the tools to be followed carry out the punching and cutting operations at 18 in order to cut the strip according to the

  flat outline of the frame, allowing it to remain

tensioned the connecting bridges 8.

  Then, during several advancement steps d, the strip undergoes a crushing operation in order to

  eliminate burrs resulting from punching and uncut

  previous pages and studs 6 are installed and used

  woven in the holes 14 made previously. This crimping operation is carried out while the frames are still in the flat developed state and connected together.

  to the others by the junction bridges 8 and the edges 9.

  Preferably, this crimping operation is carried out in two stages, firstly a setting up and

  a pre-crimping of the stud then, then, a crimping

  nal, the strip being always flat.

  This operation performed on a piece of metal

  flat tal allows to obtain a solid fixing of the studs on the part, this operation being further carried out in

  compensated time while the tool to be followed performs the

  very operations on the metal strip to obtain the

ture 1.

  Simultaneously, the following stages of work of the metal strip carry out the arching of the part along its length, the folding and the calibration of the frame in width, the striking of a reinforcement in 19, the recasting of the openings 12 to obtain a beautiful aspect of the finished part, a precision cutting of the frames at their ends at the height of the

  o10 junction bridges 8 to facilitate their subsequent separation

  then cut this strip of frames to form

  sea of sets of thirty mounts that can

  then be subjected to the painting operation.

  The frame thus produced will then receive as

  this is usual, the intermediate lifter 3, the lifter-

  deny main 4 with the wiper blade 5 as well as

  the deflector 7 and the spacer rings 8.

Claims (3)

R E V E N D I C A T I ONS   1) Method for producing deflector wiper blades comprising a frame (1) supporting the wiper blade (5) by means of lifting beams (3, 4), this frame also being provided   studs (6) supporting the deflector flap (7),   yielded characterized in that one realizes the frame by successive operations of punching, cutting, bending, bending and others of a metal strip using a tool to follow so as, first of all to form flat on the strip a succession of parallel blanks connected to the edges of the strip (9) by metal bridges (8),   then in place and the studs (6) are crimped in the   holes (15) punched for this purpose, the metal strip always being flat, then the folding and bending of the   blanks provided with their studs in order to obtain   still connected to each other by the bridges of junction (8) at the edges of the strip.   2) Process according to claim 1, ca-   characterized in that the mounting strips (1) provided with   their deflector support studs (6) are supported   put to a painting operation.   3) The frames and wipers obtained   by implementing the method according to any one   than previous claims.